Mia Love is the next one imo.
But I dont know if she campaigned on immigration.
Matheson has not signed the discharge petition or any of the amnesty bills.
Chaffetz is a Mormon. 90% of the elected Mormons in congress are amnesty peddlers.
Hatch, Chaffetz, Issa, Heller, Buck Mckeon, Mike Simpson, Labrador and Chris Stewart are amnesty supporters.
http://www.deseretnews.com/top/1108/0/17-Mormons-in-Congress-in-2013.html
Matt Salmon is the weakest Arizona house Republican on the issue. He may have switched back after his interview with Ingraham.
Mike Lee, Bishop (Utah) and Crapo are the only opponents.
Chaffetz's treason is particularly odious because the ONLY reason he's in Congress is by unseating an incumbent on a "He's pro-amnesty but I believe in enforcing the laws" message.
Talk about biting the hand that feeds you.
It would be like Obama supporting Bush's Iraq policies and "dumb wars" after getting elected President. Oh wait. ;-)